For example: Agilent E4440A or Anritsu 68369
Signal Gen/Synthesizers/Sweepers
Gigatronics 2440L
Value Line ATE RF & Microwave Synthesized Signal Generator

Manufacturer: Gigatronics
Gigatronics 2520A
Perfomance Line RF & Microwave Synthesized Signal Generator

Manufacturer: Gigatronics
Keithley Instruments 2900-ALG
Flexible Analog Modulation signal gen.

Manufacturer: Keithley Instruments
Keithley Instruments 2900-DIG
Flexible Digital Modulation Signal Generation SW

Manufacturer: Keithley Instruments
Keithley Instruments 2920-FP-BT-004
10MHz - 4GHz RF Vector Signal Generator, Front RF Input Connection, Bench Top

Manufacturer: Keithley Instruments
Keithley Instruments 2920-FP-RK-004
10MHz - 4GHz RF Vector Signal Generator, Front RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Keithley Instruments 2920-FP-RK-006
10MHz - 6GHz RF Vector Signal Generator, Front RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-BT-004
10MHz - 4GHz RF Vector Signal Generator, Rear RF Input Connection, Bench Top

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-BT-006
10MHz - 6GHz RF Vector Signal Generator, Rear RF Input Connection, Bench Top

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-RK-004
10MHz - 4GHz RF Vector Signal Generator, Rear RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-RK-004-LAR-LPN
10MHz - 4GHz RF Vector Signal Generator, Rear RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-RK-006
10MHz - 6GHz RF Vector Signal Generator, Rear RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Keithley Instruments 2920-RP-RK-006-2890-RK
10MHz - 6GHz RF Vector Signal Generator, Rear RF Input Connection, Rack Mount

Manufacturer: Keithley Instruments
Racal Instruments 3161
300 MS/S Frequency Agile Waveform Synthesizer

Manufacturer: Racal Instruments
Keysight / Agilent 3320C
10 kHz to 17 MHz Selective Level Generator

Manufacturer: Keysight / Agilent
Keysight / Agilent 3335A
200Hz - 80MHz, Synthesized/Level Generator

Manufacturer: Keysight / Agilent
Keysight / Agilent 3336A
10Hz to 20MHz, Synthesized/Level Generator

Manufacturer: Keysight / Agilent
Keysight / Agilent 3336B
10Hz to 20MHz, Synthesized/Level Generator

Manufacturer: Keysight / Agilent
Keysight / Agilent 3336C
10Hz to 20MHz, Synthesized/Level Generator

Manufacturer: Keysight / Agilent